Try rebooting the system a couple of times. Installing AV has to remove AV first before it can re-install so it can have multiple steps.
9.6 gets a bit better with this as you gain the ability to install/remove/repair individual modules (do not send the agent again).
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It looks like that may help. What I've found is that there is a difference between bundling the AV with the agent and sideloading the AV after the agent is installed. I'm not sure how to proceed in my situation now. It will take more work. Perhaps my schedule to upgrade to 9.6 will be advanced.